Incorrect line break inside attribute value

[navindex]

<label data-action="click->controller#action" ><input >Label</label>
translates to this:

<label data-action="click->\n
     controller#action" >\n
     <input >\n
     Label\n
 </label>

The expected output should be:

<label data-action="click->controller#action" >\n
     <input >\n
     Label\n
 </label>